Ajax response -- Help required

[computerzworld]

Hello,
I am using ajax for fetching data from database and if it contains some particular value then i want to give alert message. Usually what we are doing when using ajax is when ajax's response come we are assigning inside some DIV or Span's inner html.But what I want is to do is to assign ajax's response to some javascript variable and after checking the value of that variable in javascript i want to provide proper alert message. How can I pass ajax's response to javascript variable? Please help me. Thanks in advance.

[Weedpacket]

You assign to the variable in exactly the same way you assign to any other variable (or the div's innerHTML property) - the name of the variable on the left of the '=' sign, and the value you want to assign to it on the right.

[computerzworld]

thanks for reply.. but what i am trying to do is something different.. i am calling ajax to retrieve value from database and which in turns calls one another function on ready state. So, the other function is the one which retrieves the value for me. So, if I define a variable and assign my response over there then that variable will be the function specific. That I will not get outside. So, how can I exactly use it?

[Weedpacket]

What? Over where? I hope your JavaScript is easier to understand than your English.

Do you mean you want to pass what you get back in the Ajax response to a function?

Very vague, but then it's a very vaguely-presented question: "I have this thing then I have this other thing and that other thing is something." Perhaps just showing us what you're trying to do would be easier for all concerned than your trying to explain it.

computerzworld wrote:

thanks for reply.. but what i am trying to do is something different..

Well I'm sorry, but I can really only answer the question that is asked.

[computerzworld]

ok... i think my explaination seems to be confusing😕 you. Let me explain it using javascript code 🙂

Here is my javascript code which calls ajax...

               if(flg=='edit')
		{
			callInquiryAJAX('<?=base_url()?>inquiry/checkInquiry/inquiryHistoryId/'+recordIdStr1,'inquiryCheck');
             }

And here is my ajax function...

function callInquiryAJAX(url,pageElement) 
{
      try 
	  {
        req = new XMLHttpRequest(); /* e.g. Firefox */
      } 
	  catch(e) 
	  {
          try 
		  {
         	 req = new ActiveXObject("Msxml2.XMLHTTP");
   /* some versions IE */
          } 
		  catch (e)
		  {
              try 
			  {
				  req = new ActiveXObject("Microsoft.XMLHTTP");
  /* some versions IE */
              } 
			  catch (E) 
			  {
                 req = false;
              }
          }
	 }

  req.onreadystatechange = function() {responseInquiryAJAX(pageElement);};
  req.open("GET",url,true);
  req.send(null);
}

function responseInquiryAJAX(pageElement) 
{

var output = '';

if(req.readyState == 4) 
{
     if(req.status == 200) 
	 {
                    output = req.responseText;

	 }
}
}

It uses two functions one for creating xml http request and another for handling response.
But what is my question is exatly that if I use some variable to store the output in it as used output variable in responseInquiryAJAX(). How can I use it outside the function?

[computerzworld]

problem got solved 🙂
here is what i have done...

function callInquiryAJAX(url,pageElement) 
{
      try 
	  {
        req = new XMLHttpRequest(); /* e.g. Firefox */
      } 
	  catch(e) 
	  {
          try 
		  {
         	 req = new ActiveXObject("Msxml2.XMLHTTP");
   /* some versions IE */
          } 
		  catch (e)
		  {
              try 
			  {
				  req = new ActiveXObject("Microsoft.XMLHTTP");
  /* some versions IE */
              } 
			  catch (E) 
			  {
                 req = false;
              }
          }
	 }

  req.onreadystatechange = function() {responseInquiryAJAX(pageElement);};
  req.open("GET",url,false);
  req.send(null);
if(req.readyState==4)
{
    if(req.status==200)
    {
       return req.responseText;
    }
}
}

Which calls ajax synchronously and give response but in the response one extra line break comes but after some tweaks it works fine.. And I have assigned the value to javascript variable...

HTH...

[Weedpacket]

Of course, being synchronous, your entire application now locks up while it's waiting for the response from your server.

Declare the output variable outside the function.

var output = '';
function responseInquiryAJAX(pageElement) 
{
    if(req.readyState == 4) 
    {
        if(req.status == 200) 
        {
            output = req.responseText;
            }
        }
    }
}

Now its scope is no longer limited to just that function.

Another option is to pass an object to the event handler, and have responseInquiryAJAX() update its properties; when responseInquiryAJAX() returns, the object will still be updated. An example would be the "pageElement" variable you're passing around (but not using). If that's an object, then that object could be changed by responseInquiryAJAX(), and those changes will remain after responseInquiryAJAX() has returned.

function responseInquiryAJAX(pageElement) 
{
    if(req.readyState == 4) 
    {
        if(req.status == 200) 
        {
            pageElement.someProperty = req.responseText;
        }
    }
}